> far preferable to arranging a face to face meeting over this low impact, simple procedural issue

Whenever an issue involves people, slack simply won't suffice. There's too much good will lost on either side. "No worries if not [grumble grumble]!"

This isn't procedural, like sending an invoice to the wrong email address. This is a vp overstepping and threatening the success of another employee. They know what they're doing.